JPH01101155A - Liquid injector - Google Patents
Liquid injectorInfo
- Publication number
- JPH01101155A JPH01101155A JP62258722A JP25872287A JPH01101155A JP H01101155 A JPH01101155 A JP H01101155A JP 62258722 A JP62258722 A JP 62258722A JP 25872287 A JP25872287 A JP 25872287A JP H01101155 A JPH01101155 A JP H01101155A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- piezoelectric ceramic
- adhesive
- ceramic tube
- hollow tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims description 26
- 239000000919 ceramic Substances 0.000 claims abstract description 29
- 239000000853 adhesive Substances 0.000 claims abstract description 21
- 230000001070 adhesive effect Effects 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000004642 Polyimide Substances 0.000 abstract description 3
- 229920001721 polyimide Polymers 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1621—Manufacturing processes
- B41J2/1623—Manufacturing processes bonding and adhesion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1607—Production of print heads with piezoelectric elements
- B41J2/1615—Production of print heads with piezoelectric elements of tubular type
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、インクジェットプリンタにおけるインク噴射
装置や、医療用機器若しくは理化学計測機器等に使用さ
れるマイクロポンプ等の液体噴射装置に関するものであ
り、特に、圧電セラミックス管の変形を利用して中空管
内に収容した液体を噴射する方式の液体噴射装置に関す
るものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ink ejection device in an inkjet printer, a liquid ejection device such as a micropump used in medical equipment, physical and chemical measurement equipment, etc. In particular, the present invention relates to a liquid ejecting device that uses deformation of a piezoelectric ceramic tube to eject liquid contained in a hollow tube.
［従来の技術］
液体噴射装置としては、従来より種々の方式のものが提
案され実用化されているが、近年、圧電セラミックス管
を利用した方式のものが注目を集めている。この方式の
液体噴射の原理は、液体導管の外周に圧電セラミックス
管を勘合し、この圧電セラミックス管に電圧を印加して
それを変形させることにより、液体導管内部に充満して
いる液体を液体導管先端に設けられている噴射口から噴
射させるものである。第１図は上記液体噴射装置の一例
を示す要部縦断面図である。同図において、１は圧電セ
ラミックス管であり、内外周辺に各々電極２，３を設け
、各々にリード線４．５をはんだ付けする。次に、６は
中空管であり、一方に噴射ロアを設け、接着剤８を介し
て、前記圧電セラミックス管１内面に固着するものであ
る。[Prior Art] Various types of liquid ejecting devices have been proposed and put into practical use, but in recent years, those using piezoelectric ceramic tubes have been attracting attention. The principle of this method of liquid injection is that a piezoelectric ceramic tube is fitted around the outer periphery of a liquid conduit, and a voltage is applied to the piezoelectric ceramic tube to deform it, thereby discharging the liquid filling the liquid conduit into the liquid conduit. It is sprayed from an injection port provided at the tip. FIG. 1 is a longitudinal sectional view of a main part showing an example of the liquid ejecting device. In the figure, reference numeral 1 denotes a piezoelectric ceramic tube, and electrodes 2 and 3 are provided on the inner and outer peripheries of the tube, respectively, and lead wires 4.5 are soldered to each tube. Next, 6 is a hollow tube, one of which is provided with an injection lower, and is fixed to the inner surface of the piezoelectric ceramic tube 1 through an adhesive 8.
［発明が解決しようとする問題点］
前記液体噴射装置の製造工程中の中空管６を圧電セラミ
ックス管１内面に固着する場合に使用する接着剤として
は、エキポジ樹脂を使用するのが最も一般的である。液
体噴射装置としての使用温度は０〜４０℃程度であるが
、保管若しくは輸送中には一３０℃程度の環境に置かれ
ることがあり、例えば、インクジェットプリンタにおい
ては一３０℃で一定時間保持した後、室温に戻した時の
インク吐出電圧が低ｆｉ（−３０℃）保持前より１０％
程度高くなる減少を惹起する。これは圧電セラミックス
管１内面の亀裂、中空管６の割れ、電極２の剥離等に起
因するものであり、圧電セラミックス管１および中空管
６とエポキシ樹脂８との熱膨張差があることが主原因で
あると認められる。因みに圧電セラミックスの線膨張係
数は３．Ｏｘ １０″″’／にであり、中空管としてよ
く用いられるガラスの線熱膨張係数は３，３Ｘ １０−
’ ／にであるが、エポキシ樹脂のそれは６０ｘ １
０−” ／にであり、前記問題点が生ずるのである。[Problems to be Solved by the Invention] Exposure resin is most commonly used as the adhesive used when fixing the hollow tube 6 to the inner surface of the piezoelectric ceramic tube 1 during the manufacturing process of the liquid injection device. It is true. The operating temperature for a liquid ejecting device is about 0 to 40°C, but during storage or transportation it may be placed in an environment of about -30°C. For example, inkjet printers are kept at -30°C for a certain period of time. After that, when the temperature is returned to room temperature, the ink ejection voltage is 10% higher than before holding it at low fi (-30℃).
Causes a higher degree of reduction. This is due to cracks on the inner surface of the piezoelectric ceramic tube 1, cracks in the hollow tube 6, peeling of the electrode 2, etc., and there is a difference in thermal expansion between the piezoelectric ceramic tube 1 and the hollow tube 6 and the epoxy resin 8. is recognized to be the main cause. Incidentally, the linear expansion coefficient of piezoelectric ceramics is 3. The coefficient of linear thermal expansion of glass, which is often used for hollow tubes, is 3.3X 10-
'/, but that of epoxy resin is 60x 1
0-''/, and the above-mentioned problem occurs.
本発明は上記のような従来の技術に存在する問題点を解
消し環境温度が変化しても構成部材間に不都合な熱膨張
差が発生することのない液体噴射装置を提供することを
目的とする。It is an object of the present invention to solve the problems existing in the conventional technology as described above and to provide a liquid injection device that does not cause an undesirable difference in thermal expansion between its constituent members even when the environmental temperature changes. do.
［問題点を解決するための手段１
上記従来技術の問題点解決のために、本発明においては
、内外周辺に各々電極を設けた圧電セラミックス管内に
接着剤を介して中空管を固着し、前記圧電セラミックス
管に駆動電圧を印加し、圧電セラミックス管および中空
管を変形させて中空管内に収容した液体を噴射させるよ
うにした液体噴射装置において、前記接着剤として前記
圧電セラミックス管若しくは中空管を構成する材料の線
膨張係数と近似した線膨張係数を有する接着剤を使用す
るという技術的手段を採用したことを特徴とするもので
ある。本発明における接着剤としては例えば樹脂の中で
は熱膨張係数の小さい、低熱膨張性ポリイミド等を使用
する。また、本発明において、上記中空管は通常、ガラ
ス管が用いられるが、プラスチック管、金属管を用いる
ことも可能である。[Means for Solving Problems 1] In order to solve the problems of the above-mentioned prior art, in the present invention, a hollow tube is fixed with an adhesive inside a piezoelectric ceramic tube provided with electrodes on the inner and outer peripheries, In the liquid injection device, the liquid ejecting device applies a driving voltage to the piezoelectric ceramic tube to deform the piezoelectric ceramic tube and the hollow tube to inject the liquid contained in the hollow tube. It is characterized by the adoption of a technical measure of using an adhesive having a coefficient of linear expansion similar to that of the material constituting the tube. As the adhesive in the present invention, for example, a low thermal expansion polyimide, which has a small coefficient of thermal expansion among resins, is used. Further, in the present invention, a glass tube is usually used as the hollow tube, but a plastic tube or a metal tube can also be used.
［作 用］
本発明により、圧電セラミックス管及び、中空管と接着
剤との間の線膨張係数差はなくなり、ヒートショック時
の圧電セラミックス管内面の電極剥離等の不良を低減す
る効果が期待できる。[Function] The present invention eliminates the difference in linear expansion coefficient between the piezoelectric ceramic tube, the hollow tube, and the adhesive, and is expected to have the effect of reducing defects such as electrode peeling on the inner surface of the piezoelectric ceramic tube during heat shock. can.
第２図に一８０℃のヒートショックを与えた時に圧電セ
ラミックス管と接着剤間に加わる引張り応力と接着剤の
線熱膨張係数との関係を示すが、電極剥離等の不良が生
じないためには、接着剤の熱膨張係数は１５Ｘ１０４以
下であることが必要である。Figure 2 shows the relationship between the tensile stress applied between the piezoelectric ceramic tube and the adhesive when a heat shock of -80°C is applied and the linear thermal expansion coefficient of the adhesive. It is necessary that the coefficient of thermal expansion of the adhesive is 15×104 or less.
［実施例］
低熱膨張性ポリイミド（線熱膨張係数４Ｘ１０４）を接
着剤として用いて、中空ガラス管と圧電セラミックス管
を接着し、液体噴射装置を作製した。[Example] Using low thermal expansion polyimide (linear thermal expansion coefficient 4×104) as an adhesive, a hollow glass tube and a piezoelectric ceramic tube were bonded together to produce a liquid injection device.
これに、−２０℃と６０℃間のヒートショック試験（４
サイクル）を実施した。実験後のクラック、電極剥離等
の不良発生は１００本中０本であり、インク吐出電圧は
試験前後で変化はなかった。同時に、エポキシ樹脂を接
着剤として用いた液体噴射装置のヒートサイクル試験も
実施したがインク吐出電圧が１０％以上高くなったもの
は１００本中２１本であり、これらのサンプルには、電
極剥離、クラックが生じていた。In addition, heat shock test between -20℃ and 60℃ (4
cycle) was carried out. After the experiment, no defects such as cracks or electrode peeling occurred out of 100, and there was no change in the ink ejection voltage before and after the test. At the same time, heat cycle tests were conducted on liquid ejecting devices using epoxy resin as an adhesive, but 21 out of 100 showed an increase in ink ejection voltage of 10% or more. A crack had occurred.
［発明の効果］
本発明は以上記述のような構成および作用であるから、
圧電セラミックス管および中空管と接着剤層との間の熱
膨張差を低減させ、構成部材のクラック若しくは割れま
たは剥離等の不良発生を防止し、品質を大幅に向上させ
得るという効果がある。[Effect of the invention] Since the present invention has the structure and operation as described above,
This has the effect of reducing the difference in thermal expansion between the piezoelectric ceramic tube or hollow tube and the adhesive layer, preventing the occurrence of defects such as cracking, splitting, or peeling of component members, and significantly improving quality.
第１図は本発明の対象である液体噴射装置の一例を示す
要部縦断面図、第２図はヒートショック時（ΔＴ−８０
℃）に圧電セラミックス管（外径１．１φ、内径０．１
３φ）と接着剤（１１μｍ）間に加わる引張り応力と接
着剤の線熱膨張係数の関係を示す図である。
１：圧電セラミックス管、２：接着剤。FIG. 1 is a longitudinal cross-sectional view of essential parts showing an example of a liquid injection device that is the object of the present invention, and FIG.
℃) and a piezoelectric ceramic tube (outer diameter 1.1φ, inner diameter 0.1
3φ) and an adhesive (11 μm) and the relationship between the linear thermal expansion coefficient of the adhesive and the adhesive. 1: piezoelectric ceramic tube, 2: adhesive.
Claims (2)
内に接着剤を介して中空管を固着し、前記圧電セラミッ
クス管に駆動電圧を印加し、圧電セラミックス管および
中空管を変形させて中空管内に収容した液体を噴射させ
るようにした液体噴射装置において、前記接着剤として
前記圧電セラミックス管若しくは中空管を構成する材料
の線膨張係数と近似する線膨張係数を有する接着剤を使
用することを特徴とする液体噴射装置。(1) A hollow tube is fixed with an adhesive inside a piezoelectric ceramic tube with electrodes provided on the inner and outer peripheries, and a driving voltage is applied to the piezoelectric ceramic tube to deform the piezoelectric ceramic tube and the hollow tube to create a hollow tube. In a liquid ejecting device configured to eject a liquid contained in a tube, an adhesive having a coefficient of linear expansion similar to a coefficient of linear expansion of a material constituting the piezoelectric ceramic tube or hollow tube is used as the adhesive. A liquid injection device featuring:
ジェットプリンタ用であることを特徴とする特許請求の
範囲第１項に記載の液体噴射装置。(2) The liquid ejecting apparatus according to claim 1, wherein the liquid contained in the hollow tube is ink, and the liquid ejecting apparatus is for use in an inkjet printer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62258722A JPH01101155A (en) | 1987-10-14 | 1987-10-14 | Liquid injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62258722A JPH01101155A (en) | 1987-10-14 | 1987-10-14 | Liquid injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01101155A true JPH01101155A (en) | 1989-04-19 |
Family
ID=17324180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62258722A Pending JPH01101155A (en) | 1987-10-14 | 1987-10-14 | Liquid injector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01101155A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007527330A (en) * | 2003-07-01 | 2007-09-27 | ナンヤン テクノロジカル ユニヴァーシティー | Piezoelectric tube |
-
1987
- 1987-10-14 JP JP62258722A patent/JPH01101155A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007527330A (en) * | 2003-07-01 | 2007-09-27 | ナンヤン テクノロジカル ユニヴァーシティー | Piezoelectric tube |
| JP4922755B2 (en) * | 2003-07-01 | 2012-04-25 | ナンヤン テクノロジカル ユニヴァーシティー | Method for forming a piezoelectric tube |
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